Looking for a Map: Minigame "The Undead are advancing alert the sentries!"

[Boxey]

Hi, I'm looking for a map that had this minigame, small rectangular arena, supposed to be mocking DotA I guess, had a tree of life on one side and a necropolis on the other and you had to just survive as long as possible.

The most distinct memory I have is that the "The undead are advancing line" pulled from the campaign was either distorted or spoken by someone intentionally trying to sound silly.